Lake Michigan's peak trolling window opens as Chinook and coho stage offshore

What's biting

What's next

Without current weather or flow data in this report cycle, day-by-day specifics carry more uncertainty than usual — check NOAA and the NWS Grand Haven forecast before planning a trip.

That said, seasonal timing offers a reliable frame. Late June on Lake Michigan is when Chinook begin concentrating in the upper water column as surface temps warm and baitfish compress near the thermocline. With forage conditions reportedly strong heading into this season, standard summer trolling setups — spoons and body baits run on downriggers or planer boards targeting the 40- to 60-foot depth range — are the baseline approach. If surface temps have warmed into the upper 50s to low 60s (typical for this stretch of shoreline by late June), expect fish suspended at the thermal break rather than hugging the bottom.

The full moon on June 28 shapes this weekend's timing windows. Many veteran Lake Michigan trollers note that full-moon periods push Chinook and coho to feed hardest at first and last light while midday action flattens. Early Saturday and Sunday morning runs — launching before dawn to be set up on fish as the sun rises — are likely to produce the most consistent action over the coming days.

On the Grand River itself, walleye summer patterns favor deeper holes and current breaks below structure. Flows can rise quickly after summer storms, which temporarily improves walleye bite as fish move in response to current. Monitor USGS gauge readings before each trip. Slip-sinkers and jig-and-minnow combinations drifted through deeper runs are the go-to presentation once surface temps push into the mid-60s.

Smallmouth bass at the river mouth and along the Lake Michigan nearshore are typically in their most predictable window by late June. Rocky structure, current seams near the river mouth, and scattered boulders on the nearshore flat are worth working with tubes, drop shots, or crayfish-imitating crankbaits. Bass have largely recovered from the spawn and are feeding aggressively — this stretch of the season typically delivers the most consistent catch rates before summer heat pushes fish deeper.

Context

Late June is historically one of the most productive stretches on Lake Michigan's Michigan shoreline and connected river systems. The Chinook salmon run does not peak until August and September — when fish push into tributaries like the Grand River in significant numbers — but the offshore pre-run staging that builds through late June and July is when many experienced Great Lakes anglers target the largest fish on open water.

The WI DNR Lake Michigan Fishing Report's 2024 harvest documentation — record coho at more than 210,000 fish and the strongest Chinook showing since 2012 at over 160,000 — provides meaningful multi-year context. Michigan's Lake Michigan salmonid fisheries draw from the same alewife forage base as the Wisconsin side; a healthy alewife class that boosts stocked-fish survival does not respect state lines. The conditions that produced Wisconsin's 2024 numbers point to a broader lake-system dynamic that likely carried into 2026 survival rates on the Michigan side as well.

Wired 2 Fish's analysis of round gobies as an unexpected net positive for Great Lakes fisheries adds a structural layer to that picture. Gobies, now firmly established throughout the lake, provide a year-round secondary protein source that has contributed to larger average sizes in salmon and lake trout — a forage-base shift that persists independent of the seasonal alewife cycle.

For the Grand River mouth specifically, this time of year has historically been transitional. Spring steelhead have largely returned to the lake by late June. Walleye dispersed from spring spawn staging are settling into summer holding areas in deeper river runs. The Chinook run that builds toward the river mouth through August is still weeks from its peak. Anglers who know this stretch have long focused on open-lake trolling for staging salmon, river walleye in deeper summer holes, and post-spawn smallmouth bass along rocky nearshore structure — a late-June mix that has defined this fishery for decades. No current-week MI DNR Weekly Fishing Report data was available in this cycle for direct year-over-year comparison.